This is because butterfly caterpillars are host specific. Plant-wise, the caterpillars of some butterfly species like asters, black-eyed Susan, clover, lupines, milkweed, sedum or violets. Aspen, birch, cherry, hackberry, oak or willow trees make caterpillars of other butterfly species equally happy.
each Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.ach Br-F bond would be polar or BF4-, there is an extra electron making this a polar molecule. PCl5 has the Cl atoms that must be as far apart from each other as possible and therefore would create equal but opposite pulls.
Polarity is determined by the dipole-dipole moment about a molecule. If a molecule has ligands (atoms bonded to it) that are different in their electronegativity, such as CH3C â¦ l, it will be very polar. molecule like CH4, (methane), will be nonpolar. All the ligands attached to carbon have the same electronegativity, so there is no difference in dipole around carbon.